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      What Happens the Morning After? The Costs and Benefits of Expanding Access to Emergency Contraception : The Costs and Benefits of Expanding Access to Emergency Contraception

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      Journal of Policy Analysis and Management
      Wiley-Blackwell

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          The Power of the Pill: Oral Contraceptives and Women’s Career and Marriage Decisions

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            The Impact of Legalized Abortion on Crime

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              Likelihood of conception with a single act of intercourse: providing benchmark rates for assessment of post-coital contraceptives

              Emergency post-coital contraceptives effectively reduce the risk of pregnancy, but their degree of efficacy remains uncertain. Measurement of efficacy depends on the pregnancy rate without treatment, which cannot be measured directly. We provide indirect estimates of such pregnancy rates, using data from a prospective study of 221 women who were attempting to conceive. We previously estimated the probability of pregnancy with an act of intercourse relative to ovulation. In this article, we extend these data to estimate the probability of pregnancy relative to intercourse on a given cycle day (counting from onset of previous menses). In assessing the efficacy of post-coital contraceptives, other approaches have not incorporated accurate information on the variability of ovulation. We find that the possibility of late ovulation produces a persistent risk of pregnancy even into the sixth week of the cycle. Post-coital contraceptives may be indicated even when intercourse has occurred late in the cycle.
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                Author and article information

                Journal
                Journal of Policy Analysis and Management
                J. Pol. Anal. Manage.
                Wiley-Blackwell
                02768739
                January 2014
                January 2014
                : 33
                : 1
                : 70-93
                Article
                10.1002/pam.21731
                3bc121e7-d374-4af3-930d-0815507fec9e
                © 2014

                http://doi.wiley.com/10.1002/tdm_license_1.1

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